Cygnus arrival at ISS delayed by at least 2 days: NASA

The unmanned Cygnus cargo vessel, scheduled to arrive Sunday morning at the International Space Station, has been delayed by at least 48 hours due to a software problem, NASA said.

Orbital Sciences Corp, which on Wednesday launched the capsule on an Antares rocket, confirmed that Cygnus had established contact with the space station, but was prevented from continuing approach, the agency said.